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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb24de076dd4c50c3d9c4b232ad6333e3413adcb6be64df28f72bca98216e67' 
  AND token = 'arF6nFl/RT8+m+Xtw6NzygJUW/dKvj+Xo7PIea99SQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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