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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8cc689048be05b0612fe4ab6b899fd9ca9c9ac4a083094e264adc48e132c07' 
  AND token = '5+mz+P+qPOhICzLX8bns7azYVyPLSRp+OWXF18zw72o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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