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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4acc90d2f8cb3e0ce11e170493788ceaef50b29eba485258ea373e69b70ccb' 
  AND token = 'rudIwnHy/kq87Bmmwq6zRItv5yJ9oBluIVfuSkQYK3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}