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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4daac3e9c830197019367cb9c4b8916e468d8c926f783b674d940c1d04a1bde' 
  AND token = '6NYvJHfR5kIe1xXUxvKPp4QagiJ9qdCJW1PQED1HaVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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