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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e8cc63d8ff66a9b9854c02cc6a8af0da024a755ee1f36df28a8f8472afc5ea' 
  AND token = 'cIZtt/snpHCpHiFeOsat4tsbFwxYVfS6p+ytJpavb94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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