SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dca9c7185dbf161de9ef8d45f03d3d1b77193022ce6449a97df10a47cc38d0' 
  AND token = 'gvjtthdJQQZlD3GKNCxg3VYvn+fOy2OS3yLC0q7uvek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00235

JSON explain

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