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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c87203ba5c8aaa41ddba9d4fdf7fffee56354ca95e1f02fe8a30eb93e876d5' 
  AND token = 'Y5qdud3PkeaEK2sFqNVcPUglDE/8O7ALhcyRiOFe/pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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