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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c556ded8e637370c3c0d11aed35629179098353538255f8deb93db3b93931b2' 
  AND token = 'fWMajyl7sBz2k1Jic3soR4yuOIcxwaDQCID+9BXD4WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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