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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3236dc09586bc90502056dc670f53e8a55183c4e1a53c5c928f1b11108ca6ec4' 
  AND token = 'iQh4kk5FDSjUd22swCRTqvtCCDvLMoTOKcsZJeybjzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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