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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c3750bc1de8315196ad75450570716c919d758079847ec324e90d7336a91ad' 
  AND token = 'i7oyRs0XMYbh/nFE67ed1A1JZwFOo01muF16KoiYMCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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