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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b512541047a8f71d128bb026e065373189e111876cc0d1664efa2cf2c5e1c7' 
  AND token = 'AfKYWT1zzrqm5B0/nkbQqU8EK3DtgD7eezoNSnKHU24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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