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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d307a27cf95adca84e2c0cc246fdda27fc43c643293ea0f3a2afa1775afc951' 
  AND token = 'Ta3Kw90iX8CJRaBl5l6JtuAoVu97EHZ4pfZVH8Kz3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00712

JSON explain

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