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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b132fdd919b897ed1adaabbf2a7e017ce709c9c2cc6e03a4aeefbc28a6a24e07' 
  AND token = 'hl45NzkZJGQ3HEUDMftc+D3cCwc+MfycN1Cp48tKSmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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