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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863b674a1bc4fe69621612db32ac68d758e601ea781c2b0e82f62e4cd86b9583' 
  AND token = 'C2v9mKDY4tVqZHu/rFdFH444GH825IHZKVyEoj8q1QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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