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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac06cc2f481f574813e1aa3b024bbe49ccb1cfa5365920675c7d70aed77297d1' 
  AND token = 'qRI01sF0YZ/ob/Tv6yHl8IgiBbSu7esXO/sa8uKimG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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