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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db64ccfea09dc7ed46cffb2b56c9d58099574a157eeda0b1dc6fbdba97b717e' 
  AND token = 'noJWyu9mf0enR8I1xuwNlC4kjHA9v2UjXcvkeeX22I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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