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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59c3ca2b4af6e2ae3f1d0ae306f52a0ac4aebd9f0d742a7b5f200513083c44f' 
  AND token = '8nVQYBsEs7SRB7tSlENzWK0bHGGcnuEUfGF8TRD0z2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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