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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58da7161c7d56284cef72575cb5867b7c38c765efe8c20bc5f35e9e171395faf' 
  AND token = 'YrWgZ3WN2rJ+JMY5tnl1CSK7Gq4VnlJXOOJ1FIKkvsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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