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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ca332a14ba620e01434c64655ae39f716018cfe1022fdf37326dbff3bc1e3' 
  AND token = 'H0leTX5eW2czVT1sXNw0eWi++8C8jXEnJKpoR18Rf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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