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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e332b7a71477a79b00eb050dad4ead706edeeaf4c8d9e58e12e47dbbfa5f84a' 
  AND token = 'h2SSA6xg3ueqCFWtjF7Kmft0Wo10f52gGukqkGPdpYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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