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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0b068c9447e5566856dcee8e3a8fce769a729b63a35dcec47482c8b60425b8' 
  AND token = '6R8HLVbhslBfdND+1nunDYMPGG6v/r9taUMtEhJEFzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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