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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a29d485856f5dc6cbea746ab4ed0063a54bb7288659ee1d8daf5348613783ea' 
  AND token = '7m7buQCol4gWAs4aM0hKMi153OIr4FG+LHvnNZLRmog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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