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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63793ff3370020ba281d1414b1aa89d72e5d86ec0ac4243c48abd77c63c6caa' 
  AND token = 'ky7AjV4tIdgX25A3rJdgo67l2VsC6+hQLKz59GGjwxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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