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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7eb4d786886d351252ece1fa7a4f18a85fcafc3e2320d559c6061243a112d7' 
  AND token = '0xjKFKd1n1QPQnmWsDV0s8pa2iJzRXcEvTucYz7CR5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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