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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d05dcaf6572be5cf2afff8f465048946cc1d1a862120aac5be637e81c4b21' 
  AND token = 'RK7Vn5XRkhlzXPrKE3YIBA+m4U4e+caqsq7UJH10Y+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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