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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a152df0681d798cb3bc9e376f871c2fe5f85e4de7ce6a0daba7debb121339cb' 
  AND token = 'bgoGO5wkRhd6VmGsqr0ylG0wT++ttbPycdw3pA07svA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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