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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14def43126b28771a2a16fe419dfd5d2e3c10dcdc856ef5945380026dda776bb' 
  AND token = 'T5cVi6T9XgwjNE5dsNgUayxUmOx/Psmk37ahiN9rHfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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