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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35ddff3d313b4e1e1a30d69072929e2dbb4eb8fb7328cebeb51139040ac7d1d' 
  AND token = 'B7bm4+9hKabGYYBvMcfkxd/7YMsEsWeRcOBUUadnmMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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