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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b792b63e7d2b361d4de5069115c86feba29a869481c1b67c18d3e39a1e3f3e' 
  AND token = 'teXwGOQRXZKXR4Kw5GN2O6zillRryxjEi/4yJ8lj8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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