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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd0e6cd5a470c458174a779ddb90060dc110fbb2378a526581ff691071da6d9' 
  AND token = 'WCIaeV37r/0CIxXYbDgpfXzMKf28un5acVpdF6OHUU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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