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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e014d2f6e634cd66ac5e0fa9d3806bc4b476d5af87d9851ec550b8e54b3eaef7' 
  AND token = '66xB3H4kH3Yrfp2Eto2U7s1uqG2KH0Ck5cYXCi/mlIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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