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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be87caf363e795fdc4de206c3e1d980ba095735a51b0bf3ade7c8bb68f29745a' 
  AND token = 'k7RmEutJoAzWRel5aQj5J61GMNk0i/brRg4hUwaJUYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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