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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1839c34b4aabdf7826aa66c2d1b74f928d13348d8ef76b4ce4f9d73eb799ae8' 
  AND token = 'HgtmdCCQqyjjxOqBuDnGxT4A7MoXaQ2GCUHzSsNn7p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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