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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eba5250060970b3ab0a9b43a38b9d1ac2bb2e2e4397815a6c89634b7cf13321' 
  AND token = 'gCCQbCquzKLfelyzoCY/kO+Ezw4MnYRTKiAnrvssvyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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