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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c34a626e2e7a640b5d7b550128000eaefcffdf8ea824dcc4577b997d664c1d' 
  AND token = 'vGicNgUvmEYA1XP77WhshAPF/9M+O2DiVJSej+c7R2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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