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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba095bc15ab4a5848448ebc50d676a38c54e4607aa9c19d6ee67071b9b91c44' 
  AND token = '9Q1HPfSLBGr1a9U9H/t8DvAguj7JB7+NmTHcUN8bLqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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