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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa76b94e940d7e39a6b3d3c8e61861528ade666cd9d9c9fe218e093fb7d652b' 
  AND token = 'D8Qk4YRo1FGje+cGO5DOxphLwY7jf/TiCzIFxFDFxkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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