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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907ce4a1172ecd1c6e2bcbd262b61658c579ce08c78ebb39a3f3e630d8b7f557' 
  AND token = 'fwkxt5dw/5GI+ZuAEB/58HqSCP8jh7fA1DZB0FzRHIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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