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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46cf9370253d8faf3327c28240109611931bceb0c9fd8b220e4a574f773d4ef' 
  AND token = 'QZl2rMUKHgP4FDo84efSn2eM6FfJt17YpEEOPvku+v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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