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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9ad7c734ed84c652a4bd4d28952912d871a9c63249ba15f83de310b90257ae' 
  AND token = 'HnxZtTckdry2pNFqLacCQp0xPGlVD/Suzr6G7he4Vnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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