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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca0a28234619d3c850c9f435acc4108c4e6d0188e4e5ebce062af38d5d1f0d8' 
  AND token = '7jIFU426ls2c083l3h8XnxR4cVH6cqY1rdOpl0BpLHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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