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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc31d2e1343c14a2430a727c5120b1162cf86aa6c618a84a0367e7a9e684134d' 
  AND token = '5XWHpSyam5DfmIbNjKYF8H108J+mfZjiJ7yTduPZKJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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