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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c97d4d3518973be4ad9032aecb726be1f0dbd5dfbaa4bda24487383a2f5c76' 
  AND token = 'UTpa/TWh/y14Pk/ZW6RKB5g6hwVaZ3EzUfPrUlYee0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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