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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3df186c9ef3ccc9fd32e73878446fc3b976b59801c9a91f68218664398a733' 
  AND token = 'ED4epCNWiLWIU0OPzo/qRDbRRPAb0QRSq5eEtATEobQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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