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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc77f7daa4d694eb6ab0d9e967fab4d6213c131eef6879f5e51b95223b1cab58' 
  AND token = 'Gv820YVkkshIPkX4AepLo4tDwd2Xztz44vgHdyEA+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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