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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85112f2fa5f4220f8d526f167427c6fe6bf08fd5c62e3cdbeab94dd513a26651' 
  AND token = 'rHAhzP8sRx45ssNjuIynAymMUIgU4GU0ESpX6sPVSFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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