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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788399fd8fbc55791fb239f79bf34bc566ebf41ed51834a3f937ff4a89bc5dc5' 
  AND token = 'Rw8SnKoQj29uBJATHc3WBQUhnHU0fE/ckLlHiBtfEP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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