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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512afb0624919df6d2d9edc73c1d021a67ae046c169a667c8d1ae3c8e38cd087' 
  AND token = '4MsTezMUOEBgDQ41sYC27/Mrvti3P/UO4ZUXfzA0PQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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